649668794 has 8 divisors (see below), whose sum is σ = 975692628. Its totient is φ = 324437920.

The previous prime is 649668791. The next prime is 649668839. The reversal of 649668794 is 497866946.

649668794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 603930625 + 45738169 = 24575^2 + 6763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (649668791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196187 + ... + 199470.

Almost surely, 2^649668794 is an apocalyptic number.

649668794 is a deficient number, since it is larger than the sum of its proper divisors (326023834).

649668794 is a wasteful number, since it uses less digits than its factorization.

649668794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396480.

The product of its digits is 15676416, while the sum is 59.

The square root of 649668794 is about 25488.6012562479. The cubic root of 649668794 is about 866.0919502982.

The spelling of 649668794 in words is "six hundred forty-nine million, six hundred sixty-eight thousand, seven hundred ninety-four".